name = Thaliacea

regnum = Animalia
phylum = Chordata
subphylum = Urochordata
classis = Thaliacea
classis_authority = Nielsen, 1995
subdivision_ranks = Orders
subdivision =
* Pyrosomida
* Salpida
* Doliolida
The Thalicea comprise a class of marine animals within the subphylum Urochordata. Unlike their bottom-dwelling relatives the ascidians, thaliaceans are free-floating for their entire lifespan. There are three orders of Thaliacea: Pyrosomida, Doliolida, and Salpida. Pyrosomes are colonies of tiny zooids arranged around a central chamber called the cloaca. As the water exhaled by the zooids exits the cloaca through a common opening, the water movement slowly propels the pyrosome through the sea. Doliolids and salps alternate between solitary and colonial life stages. Salp colonies can be several meters in length. Doliolids and salps rely on muscular action to propel themselves through surrounding sea water, whereas the ciliary feeding currents of pyrosomes are their source of locomotion. All of the thaliceans are filter feeders. They have a barrel-shaped body through which they pump water, propelling them through the sea and from which they extract food.

External links

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Look at other dictionaries:

  • Thaliacea — Tha li*a ce*a, n. pl. [NL. See {Thalia}.] (Zo[ o]l.) A division of Tunicata comprising the free swimming species, such as Salpa and Doliolum. [1913 Webster] …   The Collaborative International Dictionary of English

  • Thaliacĕa — Thaliacĕa, s. Salpen …   Meyers Großes Konversations-Lexikon

  • Thaliacea —   [griechisch], Zoologie: die Salpen …   Universal-Lexikon

  • Thaliacea — Thaliacea, ca. 40 in wärmeren Meeren lebende, pelagische, koloniebildende Arten umfassende Klasse der ⇒ Tunicata. Wenige mm bis 30 cm lang; Kiemendarm und Kloake liegen nahe beisammen. Generationswechsel mit solitärem Oozid und kolonialen… …   Deutsch wörterbuch der biologie

  • Thaliacea —   Thaliacea (Doliolida) …   Wikipedia Español

  • Thaliacea — une colonie de …   Wikipédia en Français

  • Thaliacea — Salpen Salpenkolonie Systematik Abteilung: Gewebetiere (Eumetazoa) Unterabteilung …   Deutsch Wikipedia

  • Thaliacea — Animal An i*mal, a. [Cf. F. animal.] 1. Of or relating to animals; as, animal functions. [1913 Webster] 2. Pertaining to the merely sentient part of a creature, as distinguished from the intellectual, rational, or spiritual part; as, the animal… …   The Collaborative International Dictionary of English

  • Thaliacea — noun small class of free swimming tunicates; sometimes classified as an order • Syn: ↑class Thaliacea • Hypernyms: ↑class • Member Holonyms: ↑Urochordata, ↑subphylum Urochordata, ↑Urochorda, ↑ …   Useful english dictionary

  • thaliacea — tha·li·a·cea …   English syllables

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